Looking for field location in SQL: Accounts Receivable Posting Date

Hi all, 

I have recently created a script for the field "invoiceDate" that restricts how far into the future a user can enter the date for. I am wanting to apply these restrictions as well for the posting date. This should be relatively easy, except I can not find the column in SQL at all for this entry field. Could someone please tell me which table this field is under? (Highlighted below). Thanks!